21155651302 has 4 divisors (see below), whose sum is σ = 31733476956. Its totient is φ = 10577825650.

The previous prime is 21155651273. The next prime is 21155651311. The reversal of 21155651302 is 20315655112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5288912824 + ... + 5288912827.

It is an arithmetic number, because the mean of its divisors is an integer number (7933369239).

Almost surely, 2^21155651302 is an apocalyptic number.

21155651302 is a deficient number, since it is larger than the sum of its proper divisors (10577825654).

21155651302 is a wasteful number, since it uses less digits than its factorization.

21155651302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10577825653.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 21155651302 in words is "twenty-one billion, one hundred fifty-five million, six hundred fifty-one thousand, three hundred two".