21692061 has 12 divisors (see below), whose sum is σ = 31499520. Its totient is φ = 14384520.

The previous prime is 21691979. The next prime is 21692063. The reversal of 21692061 is 16029612.

21692061 = 14⁴ + 15⁴ + ... + 40⁴.

It is not a de Polignac number, because 21692061 - 2⁷ = 21691933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21692063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4591 + ... + 8028.

It is an arithmetic number, because the mean of its divisors is an integer number (2624960).

Almost surely, 2^21692061 is an apocalyptic number.

It is an amenable number.

21692061 is a deficient number, since it is larger than the sum of its proper divisors (9807459).

21692061 is a wasteful number, since it uses less digits than its factorization.

21692061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12816 (or 12813 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21692061 is about 4657.4736714232. The cubic root of 21692061 is about 278.8904260048.

The spelling of 21692061 in words is "twenty-one million, six hundred ninety-two thousand, sixty-one".