21122154131 has 8 divisors (see below), whose sum is σ = 23301739104. Its totient is φ = 19021826880.

The previous prime is 21122154091. The next prime is 21122154133. The reversal of 21122154131 is 13145122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122154131 - 2²⁶ = 21055045267 is a prime.

It is a super-2 number, since 2×21122154131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122154097 and 21122154106.

It is not an unprimeable number, because it can be changed into a prime (21122154133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19813871 + ... + 19814936.

It is an arithmetic number, because the mean of its divisors is an integer number (2912717388).

Almost surely, 2^21122154131 is an apocalyptic number.

21122154131 is a deficient number, since it is larger than the sum of its proper divisors (2179584973).

21122154131 is a wasteful number, since it uses less digits than its factorization.

21122154131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39628861.

The product of its digits is 480, while the sum is 23.

Adding to 21122154131 its reverse (13145122112), we get a palindrome (34267276243).

The spelling of 21122154131 in words is "twenty-one billion, one hundred twenty-two million, one hundred fifty-four thousand, one hundred thirty-one".