21151041051 has 12 divisors (see below), whose sum is σ = 32805696552. Its totient is φ = 12086309088.

The previous prime is 21151041031. The next prime is 21151041061. The reversal of 21151041051 is 15014015112.

It is not a de Polignac number, because 21151041051 - 2⁶ = 21151040987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21151041001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71942170 + ... + 71942463.

It is an arithmetic number, because the mean of its divisors is an integer number (2733808046).

Almost surely, 2^21151041051 is an apocalyptic number.

21151041051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21151041051 is a deficient number, since it is larger than the sum of its proper divisors (11654655501).

21151041051 is a wasteful number, since it uses less digits than its factorization.

21151041051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143884650 (or 143884643 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 21151041051 its reverse (15014015112), we get a palindrome (36165056163).

The spelling of 21151041051 in words is "twenty-one billion, one hundred fifty-one million, forty-one thousand, fifty-one".