21497102 has 24 divisors (see below), whose sum is σ = 35696136. Its totient is φ = 9702000.

The previous prime is 21497101. The next prime is 21497123. The reversal of 21497102 is 20179412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21497101) 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, 50852 + ... + 51272.

It is an arithmetic number, because the mean of its divisors is an integer number (1487339).

Almost surely, 2^21497102 is an apocalyptic number.

21497102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21497102 is a deficient number, since it is larger than the sum of its proper divisors (14199034).

21497102 is a wasteful number, since it uses less digits than its factorization.

21497102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21497102 is about 4636.4967378399. The cubic root of 21497102 is about 278.0523942446.

The spelling of 21497102 in words is "twenty-one million, four hundred ninety-seven thousand, one hundred two".