21012505151 has 8 divisors (see below), whose sum is σ = 22925081808. Its totient is φ = 19100320000.

The previous prime is 21012505141. The next prime is 21012505153. The reversal of 21012505151 is 15150521012.

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-21012505151 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 (21012505153) 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, 20591 + ... + 206031.

It is an arithmetic number, because the mean of its divisors is an integer number (2865635226).

Almost surely, 2^21012505151 is an apocalyptic number.

21012505151 is a deficient number, since it is larger than the sum of its proper divisors (1912576657).

21012505151 is a wasteful number, since it uses less digits than its factorization.

21012505151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195753.

The product of its (nonzero) digits is 500, while the sum is 23.

The spelling of 21012505151 in words is "twenty-one billion, twelve million, five hundred five thousand, one hundred fifty-one".