21522077157 has 64 divisors (see below), whose sum is σ = 36037376000. Its totient is φ = 11149850880.

The previous prime is 21522077149. The next prime is 21522077177. The reversal of 21522077157 is 75177022512.

It is not a de Polignac number, because 21522077157 - 2³ = 21522077149 is a prime.

It is a super-2 number, since 2×21522077157² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522077147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 888594 + ... + 912492.

It is an arithmetic number, because the mean of its divisors is an integer number (563084000).

Almost surely, 2^21522077157 is an apocalyptic number.

It is an amenable number.

21522077157 is a deficient number, since it is larger than the sum of its proper divisors (14515298843).

21522077157 is a wasteful number, since it uses less digits than its factorization.

21522077157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24026.

The product of its (nonzero) digits is 68600, while the sum is 39.

Adding to 21522077157 its reverse (75177022512), we get a palindrome (96699099669).

The spelling of 21522077157 in words is "twenty-one billion, five hundred twenty-two million, seventy-seven thousand, one hundred fifty-seven".