21010974 has 16 divisors (see below), whose sum is σ = 42916608. Its totient is φ = 6854552.

The previous prime is 21010973. The next prime is 21010987. The reversal of 21010974 is 47901012.

It is a super-2 number, since 2×21010974² = 882922056857352, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010973) 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, 36972 + ... + 37535.

It is an arithmetic number, because the mean of its divisors is an integer number (2682288).

Almost surely, 2^21010974 is an apocalyptic number.

21010974 is an abundant number, since it is smaller than the sum of its proper divisors (21905634).

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

21010974 is a wasteful number, since it uses less digits than its factorization.

21010974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74559.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21010974 is about 4583.7729001337. The cubic root of 21010974 is about 275.9404671009.

Adding to 21010974 its reverse (47901012), we get a palindrome (68911986).

The spelling of 21010974 in words is "twenty-one million, ten thousand, nine hundred seventy-four".