21041897958 has 40 divisors (see below), whose sum is σ = 47159275680. Its totient is φ = 7012502640.

The previous prime is 21041897957. The next prime is 21041897971. The reversal of 21041897958 is 85979814012.

It is a happy number.

21041897958 is a `hidden beast` number, since 210 + 418 + 9 + 7 + 9 + 5 + 8 = 666.

It is a super-2 number, since 2×21041897958² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041897953) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 997363 + ... + 1018241.

It is an arithmetic number, because the mean of its divisors is an integer number (1178981892).

Almost surely, 2^21041897958 is an apocalyptic number.

21041897958 is an abundant number, since it is smaller than the sum of its proper divisors (26117377722).

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

21041897958 is a wasteful number, since it uses less digits than its factorization.

21041897958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27114 (or 27105 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 21041897958 in words is "twenty-one billion, forty-one million, eight hundred ninety-seven thousand, nine hundred fifty-eight".