21421021032 has 24 divisors (see below), whose sum is σ = 58015265490. Its totient is φ = 7140340320.

The previous prime is 21421021009. The next prime is 21421021067. The reversal of 21421021032 is 23012012412.

It is a happy number.

21421021032 is a `hidden beast` number, since 2 + 1 + 421 + 0 + 210 + 32 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13159301796 + 8261719236 = 114714^2 + 90894^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21421020996 and 21421021014.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148757019 + ... + 148757162.

Almost surely, 2^21421021032 is an apocalyptic number.

It is an amenable number.

21421021032 is an abundant number, since it is smaller than the sum of its proper divisors (36594244458).

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

21421021032 is a wasteful number, since it uses less digits than its factorization.

21421021032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297514193 (or 297514186 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21421021032 its reverse (23012012412), we get a palindrome (44433033444).

The spelling of 21421021032 in words is "twenty-one billion, four hundred twenty-one million, twenty-one thousand, thirty-two".