21021212010 has 32 divisors (see below), whose sum is σ = 51524335872. Its totient is φ = 5486386880.

The previous prime is 21021211987. The next prime is 21021212041. The reversal of 21021212010 is 1021212012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7452921 + ... + 7455740.

It is an arithmetic number, because the mean of its divisors is an integer number (1610135496).

Almost surely, 2^21021212010 is an apocalyptic number.

21021212010 is an abundant number, since it is smaller than the sum of its proper divisors (30503123862).

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

21021212010 is a wasteful number, since it uses less digits than its factorization.

21021212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14908718.

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

Adding to 21021212010 its reverse (1021212012), we get a palindrome (22042424022).

It can be divided in two parts, 210212 and 12010, that added together give a palindrome (222222).

The spelling of 21021212010 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand, ten".