20021121012 has 24 divisors (see below), whose sum is σ = 46718394912. Its totient is φ = 6673357600.

The previous prime is 20021121011. The next prime is 20021121019. The reversal of 20021121012 is 21012112002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021121011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308962 + ... + 368102.

It is an arithmetic number, because the mean of its divisors is an integer number (1946599788).

Almost surely, 2^20021121012 is an apocalyptic number.

It is an amenable number.

20021121012 is an abundant number, since it is smaller than the sum of its proper divisors (26697273900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021121012 is a wasteful number, since it uses less digits than its factorization.

20021121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87359 (or 87357 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021121012 its reverse (21012112002), we get a palindrome (41033233014).

The spelling of 20021121012 in words is "twenty billion, twenty-one million, one hundred twenty-one thousand, twelve".