21462761 has 4 divisors (see below), whose sum is σ = 22592400. Its totient is φ = 20333124.

The previous prime is 21462751. The next prime is 21462767. The reversal of 21462761 is 16726412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21462761 - 2¹⁴ = 21446377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21462767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564791 + ... + 564828.

It is an arithmetic number, because the mean of its divisors is an integer number (5648100).

Almost surely, 2^21462761 is an apocalyptic number.

It is an amenable number.

21462761 is a deficient number, since it is larger than the sum of its proper divisors (1129639).

21462761 is a wasteful number, since it uses less digits than its factorization.

21462761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129638.

The product of its digits is 4032, while the sum is 29.

The square root of 21462761 is about 4632.7919228042. The cubic root of 21462761 is about 277.9042551090.

The spelling of 21462761 in words is "twenty-one million, four hundred sixty-two thousand, seven hundred sixty-one".