21907002 has 16 divisors (see below), whose sum is σ = 47184480. Its totient is φ = 6740592.

The previous prime is 21906961. The next prime is 21907007. The reversal of 21907002 is 20070912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21907002.

It is not an unprimeable number, because it can be changed into a prime (21907007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140352 + ... + 140507.

It is an arithmetic number, because the mean of its divisors is an integer number (2949030).

Almost surely, 2^21907002 is an apocalyptic number.

21907002 is an abundant number, since it is smaller than the sum of its proper divisors (25277478).

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

21907002 is a wasteful number, since it uses less digits than its factorization.

21907002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280877.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21907002 is about 4680.4916408429. The cubic root of 21907002 is about 279.8085511002.

Adding to 21907002 its reverse (20070912), we get a palindrome (41977914).

The spelling of 21907002 in words is "twenty-one million, nine hundred seven thousand, two".