21421032 has 32 divisors (see below), whose sum is σ = 53844480. Its totient is φ = 7101440.

The previous prime is 21420991. The next prime is 21421051. The reversal of 21421032 is 23012412.

It is a super-2 number, since 2×21421032² = 917721223890048, which contains 22 as substring.

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, 2248 + ... + 6920.

It is an arithmetic number, because the mean of its divisors is an integer number (1682640).

Almost surely, 2^21421032 is an apocalyptic number.

It is an amenable number.

21421032 is an abundant number, since it is smaller than the sum of its proper divisors (32423448).

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

21421032 is a wasteful number, since it uses less digits than its factorization.

21421032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873 (or 4869 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21421032 is about 4628.2860758600. The cubic root of 21421032 is about 277.7240330273.

Adding to 21421032 its reverse (23012412), we get a palindrome (44433444).

The spelling of 21421032 in words is "twenty-one million, four hundred twenty-one thousand, thirty-two".