21153751061 has 8 divisors (see below), whose sum is σ = 23235241920. Its totient is φ = 19169073792.

The previous prime is 21153751007. The next prime is 21153751067. The reversal of 21153751061 is 16015735112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21153751061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153751067) 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, 24202940 + ... + 24203813.

It is an arithmetic number, because the mean of its divisors is an integer number (2904405240).

Almost surely, 2^21153751061 is an apocalyptic number.

It is an amenable number.

21153751061 is a deficient number, since it is larger than the sum of its proper divisors (2081490859).

21153751061 is a wasteful number, since it uses less digits than its factorization.

21153751061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48406795.

The product of its (nonzero) digits is 6300, while the sum is 32.

The spelling of 21153751061 in words is "twenty-one billion, one hundred fifty-three million, seven hundred fifty-one thousand, sixty-one".