21977155537532 has 12 divisors (see below), whose sum is σ = 41418485436216. Its totient is φ = 10143302555760.

The previous prime is 21977155537507. The next prime is 21977155537553. The reversal of 21977155537532 is 23573555177912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211318803194 + ... + 211318803297.

It is an arithmetic number, because the mean of its divisors is an integer number (3451540453018).

Almost surely, 2^{21977155537532} is an apocalyptic number.

It is an amenable number.

21977155537532 is a deficient number, since it is larger than the sum of its proper divisors (19441329898684).

21977155537532 is a wasteful number, since it uses less digits than its factorization.

21977155537532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422637606508 (or 422637606506 counting only the distinct ones).

The product of its digits is 69457500, while the sum is 62.

The spelling of 21977155537532 in words is "twenty-one trillion, nine hundred seventy-seven billion, one hundred fifty-five million, five hundred thirty-seven thousand, five hundred thirty-two".