21995681051519 has 24 divisors (see below), whose sum is σ = 25621750712448. Its totient is φ = 18827710055280.

The previous prime is 21995681051483. The next prime is 21995681051579. The reversal of 21995681051519 is 91515018659912.

It is not a de Polignac number, because 21995681051519 - 2¹⁶ = 21995680985983 is a prime.

It is a super-2 number, since 2×21995681051519² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21995681051579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146006504 + ... + 146157074.

It is an arithmetic number, because the mean of its divisors is an integer number (1067572946352).

Almost surely, 2^{21995681051519} is an apocalyptic number.

21995681051519 is a deficient number, since it is larger than the sum of its proper divisors (3626069660929).

21995681051519 is a wasteful number, since it uses less digits than its factorization.

21995681051519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154635 (or 154628 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 62.

The spelling of 21995681051519 in words is "twenty-one trillion, nine hundred ninety-five billion, six hundred eighty-one million, fifty-one thousand, five hundred nineteen".