21121555043331 has 24 divisors (see below), whose sum is σ = 30522071920704. Its totient is φ = 14074964103600.

The previous prime is 21121555043317. The next prime is 21121555043341. The reversal of 21121555043331 is 13334055512112.

It is a happy number.

21121555043331 is a `hidden beast` number, since 2 + 1 + 1 + 215 + 5 + 5 + 0 + 433 + 3 + 1 = 666.

It is not a de Polignac number, because 21121555043331 - 2³¹ = 21119407559683 is a prime.

It is a super-2 number, since 2×21121555043331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121555043311) 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, 424554600 + ... + 424604346.

It is an arithmetic number, because the mean of its divisors is an integer number (1271752996696).

Almost surely, 2^{21121555043331} is an apocalyptic number.

21121555043331 is a deficient number, since it is larger than the sum of its proper divisors (9400516877373).

21121555043331 is a wasteful number, since it uses less digits than its factorization.

21121555043331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69151 (or 69148 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 21121555043331 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred fifty-five million, forty-three thousand, three hundred thirty-one".