21522501155429 has 16 divisors (see below), whose sum is σ = 22195235971776. Its totient is φ = 20854707120000.

The previous prime is 21522501155399. The next prime is 21522501155437. The reversal of 21522501155429 is 92455110522512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21522501155429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21522501155429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522501115429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9378929 + ... + 11445929.

It is an arithmetic number, because the mean of its divisors is an integer number (1387202248236).

Almost surely, 2^{21522501155429} is an apocalyptic number.

It is an amenable number.

21522501155429 is a deficient number, since it is larger than the sum of its proper divisors (672734816347).

21522501155429 is a wasteful number, since it uses less digits than its factorization.

21522501155429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068196.

The product of its (nonzero) digits is 360000, while the sum is 44.

The spelling of 21522501155429 in words is "twenty-one trillion, five hundred twenty-two billion, five hundred one million, one hundred fifty-five thousand, four hundred twenty-nine".