21021020192 has 48 divisors (see below), whose sum is σ = 41663444760. Its totient is φ = 10440050688.

The previous prime is 21021020161. The next prime is 21021020239. The reversal of 21021020192 is 29102012012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17999978896 + 3021041296 = 134164^2 + 54964^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3345758 + ... + 3352034.

Almost surely, 2^21021020192 is an apocalyptic number.

It is an amenable number.

21021020192 is a deficient number, since it is larger than the sum of its proper divisors (20642424568).

21021020192 is a wasteful number, since it uses less digits than its factorization.

21021020192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973 (or 6965 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21021020192 in words is "twenty-one billion, twenty-one million, twenty thousand, one hundred ninety-two".