21023201451 has 32 divisors (see below), whose sum is σ = 34243550208. Its totient is φ = 11210664960.

The previous prime is 21023201431. The next prime is 21023201557. The reversal of 21023201451 is 15410232012.

It is not a de Polignac number, because 21023201451 - 2⁷ = 21023201323 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 (21023201431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 511006 + ... + 550611.

It is an arithmetic number, because the mean of its divisors is an integer number (1070110944).

Almost surely, 2^21023201451 is an apocalyptic number.

21023201451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21023201451 is a deficient number, since it is larger than the sum of its proper divisors (13220348757).

21023201451 is a wasteful number, since it uses less digits than its factorization.

21023201451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061691.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21023201451 its reverse (15410232012), we get a palindrome (36433433463).

The spelling of 21023201451 in words is "twenty-one billion, twenty-three million, two hundred one thousand, four hundred fifty-one".