21901463 has 2 divisors, whose sum is σ = 21901464. Its totient is φ = 21901462.

The previous prime is 21901427. The next prime is 21901489. The reversal of 21901463 is 36410912.

It is an a-pointer prime, because the next prime (21901489) can be obtained adding 21901463 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21901463 - 2⁸ = 21901207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21901403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10950731 + 10950732.

It is an arithmetic number, because the mean of its divisors is an integer number (10950732).

Almost surely, 2^21901463 is an apocalyptic number.

21901463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21901463 is an equidigital number, since it uses as much as digits as its factorization.

21901463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21901463 is about 4679.8998920917. The cubic root of 21901463 is about 279.7849667046.

The spelling of 21901463 in words is "twenty-one million, nine hundred one thousand, four hundred sixty-three".