21354625061 has 8 divisors (see below), whose sum is σ = 26623948224. Its totient is φ = 16639967520.

The previous prime is 21354625051. The next prime is 21354625087. The reversal of 21354625061 is 16052645312.

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

It is not a de Polignac number, because 21354625061 - 2⁶ = 21354624997 is a prime.

It is a super-2 number, since 2×21354625061² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354625051) 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, 138666320 + ... + 138666473.

It is an arithmetic number, because the mean of its divisors is an integer number (3327993528).

Almost surely, 2^21354625061 is an apocalyptic number.

It is an amenable number.

21354625061 is a deficient number, since it is larger than the sum of its proper divisors (5269323163).

21354625061 is a wasteful number, since it uses less digits than its factorization.

21354625061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277332811.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21354625061 in words is "twenty-one billion, three hundred fifty-four million, six hundred twenty-five thousand, sixty-one".